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gh-91320: Add _Py_reinterpret_cast() macro (#91959)

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Fix C++ compiler warnings about "old-style cast"
(g++ -Wold-style-cast) in the Python C API.  Use C++
reinterpret_cast<> and static_cast<> casts when the Python C API is
used in C++.

Example of fixed warning:

    Include/object.h:107:43: error: use of old-style cast to
    ‘PyObject*’ {aka ‘struct _object*’} [-Werror=old-style-cast]
    #define _PyObject_CAST(op) ((PyObject*)(op))

Add _Py_reinterpret_cast() and _Py_static_cast() macros.
This commit is contained in:
Victor Stinner 2022-04-27 10:40:57 +02:00 • committed by GitHub
parent f882d33778
commit 29e2245ad5
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10 changed files with 42 additions and 17 deletions
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6
Include/cpython/methodobject.h
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@ -8,9 +8,11 @@ PyAPI_DATA(PyTypeObject) PyCMethod_Type;
#define PyCMethod_Check(op) PyObject_TypeCheck(op, &PyCMethod_Type)
#define _PyCFunctionObject_CAST(func) \
(assert(PyCFunction_Check(func)), (PyCFunctionObject *)(func))
(assert(PyCFunction_Check(func)), \
_Py_reinterpret_cast(PyCFunctionObject*, (func)))
#define _PyCMethodObject_CAST(func) \
(assert(PyCMethod_Check(func)), (PyCMethodObject *)(func))
(assert(PyCMethod_Check(func)), \
_Py_reinterpret_cast(PyCMethodObject*, (func)))
/* Macros for direct access to these values. Type checks are *not*
done, so use with care. */